Substituted 1-dimethylamino pentanes and heptanes

ABSTRACT

COMPOUNDS OF THE FORMULA   AR-CH(-R)-X-N(-R&#39;&#39;)-R&#34;   IN WHICH AR IS H OR AND AROMATIC WHICH MAY BE MONO- OR POLYSUBSTITUTED OR A HETEROCYCLIC, R IS AN ALIPHATIC HAVING 1-5 CARBON ATOMS, X IS -CO OR -CH2 R&#39;&#39; AND R&#34; ARE EACH H AND ALIPHATIC HAVING 1-3 CARBON ATOMS OR   -N(-R&#39;&#39;)-R&#34;   IS A HETEROCYCLIC. THE COMPOUNDS POSSESS CARDIOVASCULAR, DIURETIC AND SPASMOLYTIC PROPERTIES.

United States Patent 3,639,476 SUBSTITUTED l-DIMETHYLAMINO PENTANES AND HEPTANES Jeannie Eberle, Chatou, Micheline Sergan, Clamart,

Claude Fauran, Paris, and Gerard M. Huguet, Malesherbes, France, assignors to Delalande S.A., Courbevoie, Hauts-de-Seine, France No Drawing. Filed Nov. 29, 1967, Ser. No. 686,722 Claims priority, application Great Britain, Dec. 13, 1966, 55,671/66 Int. Cl. C07c 87/28 US. Cl. 260-563 4 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula Ar-oH R -X-N in which Ar is H or an aromatic which may be monoor polysubstituted or a heterocyclic,

R is an aliphatic having 1-5 carbon atoms,

X is --CO or CH;,,,

R and R" are each H an aliphatic having 1-3 carbon atoms or RII is a heterocyclic.

The compounds possess cardiovascular, diuretic and spasmolytic properties.

The present invention concerns, as new industrial products having a therapeutic activity, compounds corresponding to the general formula:

RI! in which Ar represents a hydrogen atom, an aromatic radical, such as a phenyl, alpha-naphthyl or beta-naphthyl radical which radical if desired, may be monoor polysubstituted by groups of low molecular weight, for example, NH N0 C1 or alkoxy of low molecular weight, or a heterocyclic radical, such as a thienyl, furanyl, quinolyl, benzimidazolyl, pyridyl, pyrazinyl, pyrirnidinyl or fluorenyl radical,

R represents a saturated or unsaturated, linear or branched chain aliphatic radical having 1-5 carbon atoms, which radical is capable of carrying a functional group such as, an ethoxy, dimethyl-amino or hydroxy group,

R and R each represent a hydrogen atom or an aliphatic radical having 1-3 carbon atoms, or R and R" together with the nitrogen atom may form a heterocyclic radical such as a piperidine, morpholine or pyrrolidine radical and X represents a carbonyl or a methylene radical.

In addition, when X represents the methylene radical Ar may represent a cyclic unsaturated radical such as cyclohexane or cyclopentane.

According to the present invention, the process for the preparation of the compounds of the general Formula 1 in which X is a carbonyl radical is characterized in that an acid of the general formula:

Patented Feb. 1, 1972 "ice in which R and R" have the above-mentioned significance, and the desired compound thereby obtained is collected by usual means, such as evaporation of the solvent and recrystallisation.

In a preferred embodiment, the various phases of this process of the present invention are eifected in a suitable organic solvent such as benzene, the chlorination reaction is carried out at the reflux temperature of the reaction medium, whilst the amination reaction is carried out at a temperature between 10 C. and +10 C., more preferably 0 C.

The acid of the general Formula 2 may be prepared either by alkylation of an acid of the general formula:

ArCh COOH -(4) with an alkyl halide of the general formula:

Hal--R in which Ar and R are as defined above, and Hal represents a halogen atom, the reaction being carried out in liquid ammonia or benzene and in the presence of sod amide and at the boiling temperature of the reaction medium, or by alkylation of a nitrile of the general formula A1'-CH2CEN by the process described for alkylation of the acid of the general Formula 4 in order to obtain a substituted nitrile of the general formula Ar-(!3HCEN R which is then hydrolysed according to conventional processes.

According to a further embodiment of the present invention the compounds of the general Formula 1 in which X represents a carbonyl radical may also be prepared by alkylating an amide of the general formula:

in which Ar, R and R" have the above-mentioned significance, with an alkyl halide of the general Formula 5 by the above-mentioned process or with a mixed organomagnesium compound of suitable formula.

According to the present invention, the process for the preparation of the compounds of the general 'Formula 1 in which X is the methylene radical is characterised in that compounds of Formula 1 in which X represents a carbonyl radical, and which are prepared as described above, are reduced by the action of a double hydride of lithium and aluminium or by catalytic hydrogenation and the desired compounds are collected by usual means.

According to a further embodiment of the present invention, these compounds may also be prepared from nitriles of Formula 7 which are reduced with a double lithium and aluminium hydride, or by catalytic hydrogenation so as to obtain the corresponding primary amine which is then alkylated on the nitrogen atom with an alkyl halide of the general formula:

in which R and R" have the above-mentioned significance and Hal represents a halogen atom, or when R is CH by the action of a formaldehyde-formic acid mixture.

In a particular method, given by way of example Analysis.C H NO: N (percent) calculated 5.20, I

found 5.22.

Certain compounds of the general Formula 1 in which X is a carbonyl radical and which were prepared by this process are shown in Table I TABLE I Empirical Molecular E, C./ M.P., A]: R NRR formula weight Theory Found p mm. Hg 0. 12

tHs n-CsHn N (CH3): C15H23N O 233. 34 6. 6. 12 134-6/1. 5 1. 5 CtHs 7l-C2Hs N(CH3;3 cizHnN O 191. 26 7. 32 763 121 H sec-C 110 N(CH:; 2 CaHr/N O 143. 22 9. 78 9. 67 98/16 C4H3S Se0-C4H9 N( 3)2 CtzHnN O S 225. 35 6. 21 5. 96 120-125/0. 6

only, the amines of Formula 1 in which Ar is a hetero- EXAMPLE II cyclic radical may be prepared either by the Mannich reaction on derivatives of the general formula:

in which R has the above-mentioned significance by employing the amine corresponding to the desired derivative,

or by the action of an alkyl halide of Formula 5 on the ct-carbon atom of an amine of the general formula RI Ar-CH2CH2-N EXAMPLE 1 N,N-dimethyl-3-methyl-2-u-naphthyl pentanamide According to the schematic process RI Ar?HC OOH Ar-(|3HC ON R R R" (a) 3-methyl-2 a-naphth'yl pentanoic acid was first prepared by the process AICHQCOOH Ar-CH-COOH I. as follows:

A suspension of sodamine (1 mol) is prepared in liquid ammonia, and 0.5 mol of a-naphthyl acetic acid is added thereto. After half an hour (i.e. until an orange colouration is obtained), 0.5 mol of secondary butyl bromide is added. The mixture is left under reflux for 2 hours. After evaporation of the ammonia and hydrolysis, extraction is effected with ether.

The acid obtained is separated by distillation. E/0.l= 175 C., yield-83%.

(b) Then the desired compound, N,N dimethyl 3- methyl-Z-a-naphthyl pentanamide is prepared as follows:

2.22 mols of thionyl chloride are added to a benzene solution (100 ml.) of 0.73 mol of the acid thus prepared. After one hour under reflux, any excess thionyl chloride is removed.

Then a benzene solution (600 ml.) of the acid chloride thus prepared is added to a solution, cooled to 0 C., of dimethylamine (3 mols) in anhydrous ether. After treatment in water, the organic phase is washed with dilute soda. By evaporation of the benzene, a residue is obtained which is crystallised from isopropyl ether: M.Pt.=110112 C. (yielg1 ;2f7 i N,N-dimethyl-2- (4-chlorophenyl) -4-methyl pentanamide (a) First, 2-(4-chlorophenyl)-4-methyl pentanoic acid is prepared according to the schematic process Ar 0H2 ON Ar (EH-ON Ar (3H 00011 as follows:

A volatile solution of 4-chlorophenyl acetonitrile (0.2 mol) is added to a suspension of 0.2 mol sodamide in liquid ammonia. After 40 minutes 0.2 mol of secondary butyl bromide is added and the reaction is continued for 1 hour. Hydrolysis is then effected in the usual manner.

The distilled alkylated nitrile (E 0.5: 199 C.) is obtained in a yield of The alkylated nitrile (0.1 mol) is then hydrated for 12 hours under reflux by means of a mixture of equal parts of acetic acid, sulphuric acid and water. The reaction mixture is then diluted with water and extracted with ether. The volatile phase is removed by 5% soda solution. After acidification, an oily residue is obtained which is recrystallised in heptane: M.Pt.= C.,

(b) According to the same schematic process as in Example 1, the resultant acid (0.31 mol) is treated with thionyl chloride (0.8 mol) under reflux. After 1 hour the excess thionyl chloride is removed, and the residue in a benzene solution is treated directly with dimethylamine. After addition of water, the organic phase is decanted, dryed and concentrated. In this way the desired product is obtained having a M.Pt.=70 C. and in a yield of 73%.

Analysis.-C H ClNO: N (percent) calculated 5.52, found'5.46.

EXAMPLE III N,N-dimethyl-2-phenyl-4 pentynamide This compound is obtained according to the schematic process R R Ar-OIh-CON Hal-R Ar (}JHC0N\ RII R RI! as follws:

A volatile solution of N,N-dimethyl-phenylacetamide (0.16 mol) is added to a suspension of sodamide (0.16 mol) in liquid ammonia. After one quarter of an hour a volatile solution of propargyl bromide (0.16 mol) is added and the reaction continued for a further 1 hour. After evaporation of the ammonia and hydrolysis, extraction is effected with ether. By distillation /0.2= C.) 18.5 g. of the desired product is obtained.

Analysis.C H NO: N percent calculated 6.96, found 6.96.

EXAMPLE IV N,N-dimethyl-5-dimethylamino-2-phenylpentamide According to the same schematic process as in Example III, N,N-dimethyl-5-dimethylamino-2-phenyl pentamide was prepared as follows: 0.5 mol of sodamide was added to a benzene solution of 0.5 mol N,N-dimethyl phenyl acetamide. After 2 hours under reflux, the mixture is cooled to 40 C. and a benzene solution of 0.5 mol of dimethylamino-chloropropane is added. The solution is kept under reflux for a further four hours. Hydrolysis is effected and by treatment of the organic phase a residue is obtained which is distilled (E/ =150 C.) (yield =40% Analysis.C H N O: N percent calculated 11.28, found 11.15.

Certain compounds of the general Formula 1 in which X is a carbonyl radical and which were prepared according to the process described in Examples 11 and III are shown in Table II.

0.1 mol of N,N-dimethyl-3-methyl-2-(alpha naphthyl) pentanamide prepared according to Example 1, is added to a suspension of 0.1 mol of LiAlH in 300 ml. anhydrous ether.

After 4 hours under reflux, hydrolysis is effected. After filtration, the volatile solution is extracted with 4N-HCl and the organic compound which is salted out is distilled. E/0.3=133-135 C. (yield=75%).

Analysis.C H N: Calculated (percent): C, 84.65; H, 9.87; N, 5.48. Found (percent): C, 84.45; H, 9.81; N, 5.37.

Its hydrochloride melts at 224 C.

Analysis.C H NCl: Calculated (percent): C, 74.07; H, 8.98; N, 4.80; Cl, 12.15. Found (percent): C, 74.27; H, 9.06; N, 4.84; Cl, 12.13.

TABLE II Empirical Molecular E, C./ M.P.,

Ar R NR'R" formula weight Theory Found p mm. Hg C. n

CsHs 051111 150 N(CH3)2 CrsHzaNO 233. 34 6. 00 6. 05 131-3/1. 5 1. 5128 CflH5 C 117 lso N(CH3)2 CnHnNO 205. 29 6. 82 6. 94 121-4l3 C H C H9 sec. CmHzaNO 261.35 5. 36 5. 43 137-9/0.1 1. 5339 c a 4 N/ N(CH3)2 CiaHlQNO 205. 29 6. 82 6. 89 124/2 54 N Ha): CuHmNO 219. 32 6. 39 6. 24 114 N(CH3)2 CuHmNO: 235. 32 5. 95 6. 18 134/0. 3 1. 5138 EXAMPLE V EXAMPLE VII N,N-dimethyl-3-hydroxy-3-methyl-2-pentamide l-dirnethylamino-3-methyl-2( 5 -ch1oro-2-methoxy) phenyl pentane This compound was prepared by the action of a mixed organomagnesium compound on a compound at formula as follows:

A volatile solution of 0.5 mol of isopropyl magnesium bromide is added to a benzene solution of 0.5 mol of N,N- dimethyl-phenylacetamide. After heating for 1 hour under reflux 0.5 mol of 2-butanone is introduced. The solution is kept under reflux for 2 /2 hours. After hydrolysis in a hydrochloric acid medium and extraction with ether, an oily residue is obtained which is crystallised from hexane M.Pt. =68 0. (yield =60%).

Analysis.C H NO N percent calculated 5.59, found 6.19.

Certain compounds of the general Formula 1 in which X is a carbonyl radical and which were prepared by the process in Example V are shown in Table III.

According to the same process as that of Example VI, 1 dimethylamino-3-methyl-2-[(5-chloro-2-methoxy) phenylJpentane was prepared as follows:

A solution of N,N-dimethyl(2-methoxy 5 chloro) phenyl acetamide (0.78 mol) is added to a suspension of sodamide in liquid ammonia and is then treated with 0.78 mol of secondary butyl bromide. After 2 hours, hydrolysis and extraction with ether is effected. By concentration of the volatile solution, a crude product is obtained which, after chromatographic analysis, is directly treated with AlLiI-L, (0.69 mol) in anhydrous ether. After 4 hours under reflux and addition of water and soda, the amine is obtained which is distilled: E/1.5=1l5 C. (75%).

Analysis.C H ClNO: Calculated (percent): C, 66.77; H, 8.97; N, 5.19. Found (percent): C, 66.74; H, 8.98; N, 5.39.

After dissolving in ethanol and treatment with gaseous hydrochloric acid, the hydrochloride is obtained which TABLE III Molecular E, C./ M.P.,

Ar R NR Empirical formula weight Theory Found p mm. Hg C. n"

CaH5 CHzCH=CHz N (CHa)z CnHnNO 203. 27 6. 88 6. 80 127/3 1. 5331 p.N02C@H4- N (CH3)2 CuHzuNzO: 264. 32 10. p.NH2CuH4 N(CH:4)2 CnHzzNzO 234. 33 11. 96 ILNHzCqHr sec-C4119 N (CH5): HCI salt CuHzaCl N20 270. 79 10. 35

EXAMPLE VI is dried and is then recrystallised in acetone.

l-dimethylamino-B-methyl 2- alpha-naphthyl) -pentane This compound, which illustrates the preparation of the derivatives of Formula 1 in which X is a methylene radical, is prepared by the schematic process R! R! ArOHCON ArCHCH-N l I R RI! R RI! as follows:

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Analysis. C H N O Calculated (percent): C, 63.34; H, 8.13; N, 8.69. Found (percent): C, 63.22; H, 7.88; N, 8.74.

l-dimethylamino-(Z-pyridazinyl)S-methyl pentane was also prepared in the same manner.

Analysis.C H N Calculated (percent): C, 69.52; H, 10.21; N, 20.27. Found (percent): C, 69.30; H, 10.00; N, 20.45, and its monomaleate:

Analysis. -C H N O Calculated (percent): C, 59.42; H, 7.79; N, 13.00. Found (percent): C, 59.39; H,

The above-mentioned compounds according to the present invention were studied on animals in the laboratory and it was possible to demonstrate cardio-vascular, diuretic and spasmolytic activities of an interesting nature.

(A) Cardio-vascular aetivity.-When administered by intra-venous injection to dogs, cats, rabbits or rats, some ofthe described substances, in particular the hydrochloride of 1-dimethylamino-3-methyl-2-(a-naphthyl) pentane and the hydrochloride of 1-dimethylamino-3-methyl-2- cyclohexyl pentane cause hypertension.

However, other substances such as the hydrochloride of 1 dimethylamino 3 methyl-2[ (-chloro-2-methoxy) phenyl] pentane and the hydrochloride of l-dimethylamino-2-(2-pyridyl)S-methyl pentane monomaleate cause lasting hypertension.

Substances having a hypertensive effect cause peripheral vaso constriction shown by the amount of the supply of an intra-arterial transfusion effected under constant pressure on rabbits, the products being administered directly in the transfusion.

(B) Diuretic activity.-Some of the described substances have interesting diuretic properties observed on rats and dogs and have a. bearing on the elimination of water and ions. This concerns more particularly l-dimethylamino-3-methyl 2[(5-chloro-2-methoxy)phenyl]- 3-methylpentane monomaleate.

(C) Spasmolytic action-Some derivatives have a spasmolytic action demonstrated on the isolated duodenum of the rat and on the uterus in situ, in particular 1-dimethylamino-2-phenylheptane hydrochloride.

Some of these derivatives have been studied particularly, for example: I

(1) 1-dimethylamino-3-methyl-2-[(S-chloro 2 methoxy)phenyl]pentane hydrochloride: its diuretic activity is shown on rats in a dose of 5 mg./ kg. administered orally and on dogs in a dose of 24 mg./kg. administered intraduodenally. The product is hypertensive from 2 mg./kg. administered intravenously on dogs and rabbits. It is slightlyvasodilatatory. Moreover it has a vagolytic activity: it suppresses the tensional effects of acetyl choline and vagal excitation and on the isolated organ it has atropinic properties.

Its DL50 is venously on mice.

(2) l-dimethylamino 3-methyl-2-(1-naphthyl)pentane hydrochloride.

This produce is hypertensive from 0.5 mg./kg. on dogs intravenously. It has a vaso-constructive efiect in a dose of 250 ,u/kg. injected in the artery whose supply is being studied. It has mixed spasmolytic, papaverinic and atropinic properties, the first being equivalent to 0.5 papaverine on the isolated duodenum of the rat treated with barium chloride and on the uterus of the rat in situ: the second equivalent to 0.01 atropine.

mg/kg. orally and 25 mg./kg. intra- Its BL is 15.5 mg./ kg. intravenously and mg./kg. orally on the mouse.

These cardio-vascular, diuretic and spasmolytic properties make the derivatives of the present invention useful medicines in the treatment of various ailments such as hypertension, circulatory disorders of the extremities, oedemas and spasmodic ailments.

The present invention also concerns the various pharmaceutical forms for administration orally, for rectal parenteral or local administration and comprise one or more of the derivatives of Formula I and/or their salts as an active principle.

These pharmaceutical forms may be simple tablets, sugar-coated pills or pellets for intestinal or delayed disintegration capsules, solutions to be taken orally or injected, suppositories, creams, pomades or lotions and are prepared according to the art with suitable excipients for the selected form, such as talcum, starch, lactose, magnesium stearate, polyoxyethylene glycols, resins, gelatine, aqueous or oily vehicles, natural or synthetic excipients for suppositories, creams and pomades, colouring agents, aromatic agents, wetting agents, and various pads.

The active therapeutic doses depend on the subject and gravity of the case. In general, the daily dose taken orally by humans increases from 0.001 and 0.1 g.

We claim:

1. A compound of the formula and the pharmacologically acceptable acid addition salts thereof.

2. A compound according to claim 1, in which Ar is (5-chloro-2-methoxy)phenyl and R is sec-butyl.

3. A compound according to claim 1, in which Ar is a alpha naphthyl and R is sec-butyl.

4. A compound according to claim 1, in which Ar is cyclohexyl and R is sec-butyl.

References Cited UNITED STATES PATENTS 2,662,886 12/1953 Ruddy 260570.8 X 2,863,921 12/ 1958 Stiihmer 260-570.8

OTHER REFERENCES Woods: Journ. Organic Chemistry, vol. 19 (1954), pp. 1290-5.

ALEX MAZEL, Primary Examiner J. H. TURNIPSEED, Assistant Examiner U.S. Cl. X.R. 

